On 24/05/23 03:57PM, Miklos Szeredi wrote: > [trimming CC list] > > On Thu, 23 May 2024 at 04:49, John Groves <John@xxxxxxxxxx> wrote: > > > - memmap=<size>!<hpa_offset> will reserve a pretend pmem device at <hpa_offset> > > - memmap=<size>$<hpa_offset> will reserve a pretend dax device at <hpa_offset> > > Doesn't get me a /dev/dax or /dev/pmem > > Complete qemu command line: > > qemu-kvm -s -serial none -parallel none -kernel > /home/mszeredi/git/linux/arch/x86/boot/bzImage -drive > format=raw,file=/home/mszeredi/root_fs,index=0,if=virtio -drive > format=raw,file=/home/mszeredi/images/ubd1,index=1,if=virtio -chardev > stdio,id=virtiocon0,signal=off -device virtio-serial -device > virtconsole,chardev=virtiocon0 -cpu host -m 8G -net user -net > nic,model=virtio -fsdev local,security_model=none,id=fsdev0,path=/home > -device virtio-9p-pci,fsdev=fsdev0,mount_tag=hostshare -device > virtio-rng-pci -smp 4 -append 'root=/dev/vda console=hvc0 > memmap=4G$4G' > > root@kvm:~/famfs# scripts/chk_efi.sh > This system is neither Ubuntu nor Fedora. It is identified as debian. > /sys/firmware/efi not found; probably not efi > not found; probably nof efi > /boot/efi/EFI not found; probably not efi > /boot/efi/EFI/BOOT not found; probably not efi > /boot/efi/EFI/ not found; probably not efi > /boot/efi/EFI//grub.cfg not found; probably nof efi > Probably not efi; errs=6 > > Thanks, > Miklos Apologies, but I'm short on time at the moment - going into a long holiday weekend in the US with family plans. I should be focused again by middle of next week. But can you check /proc/cmdline to see of the memmap arg got through without getting mangled? The '$' tends to get fubar'd. You might need \$, or I've seen the need for \\\$. If it's un-mangled, there should be a dax device. If that doesn't work, it's worth trying '!' instead, which I think would give you a pmem device - if the arg gets through (but ! is less likely to get horked). That pmem device can be converted to devdax... Regards, John
